Added a bank account and had it instantly verified. Withdrew money and 4 days later it still hasn't hit my bank account. The withdrawal is showing as completed on Paypal. First time I've experienced this. Any idea what's going on? Hoping it will eventually hit.

He told us,it is the Fifth Third Bank.
Slow transfer is via ACH,manned by the Fed,if it is a member ,it should clear in 2-3 days.
if you want it faster,use your bank debit card and pay a fee.
When Paypal said processed,it just mean your money kept at one of the many banks which Paypal have an account,will be sent into ACH by the bank,usually in the evening after bank closed.
It should arrive at your bank same or next day,then your bank will place it in your account .
assuming all these computer hardware and software function smoothly-Paypal's bank,ACH and your bank